Clean Technologies and Environmental Policy

, Volume 16, Issue 7, pp 1235–1243 | Cite as

Graphical cogeneration analysis for site utility systems

Original Paper

Abstract

It is necessary to systematically evaluate site-wide power and heat generation, distribution, and utilization. A new graphical approach based on a Site Grand Composite Curve (SGCC) to targeting cogeneration in site utility systems is proposed to extend Pinch Analysis. The SGCC presents quantitative and visual process targets of heating and cooling requirements, site utility system targets for system steam generation and potential shaft power by steam expansion and condensation. Process indirect heat recovery by intermediate steam levels that can reduce fuel consumption is analyzed readily in the approach. The steam cascade in the SGCC clarifies the Total Site Pinch and site targets of utility very high pressure steam demand and site steam saving. This graphical analysis presents greater clarity for the quantitative interaction between processes and utility system targets than previous approaches. The influence of process variation and steam mains selection on cogeneration improvements is explored much clearer in this straightforward method.

Keywords

Site Grand Composite Curve Site targeting Steam cascade Cogeneration 

Abbreviations

c

The power conversion coefficient based on the TH model (°C−1)

Cm

Process cooling requirement (MW)

g

Steam generation from process heat recovery (MW)

Qin

The heat duty of inlet steam of the steam turbine (MW)

QVHP

Utility VHP steam target (MW)

QVHPsave

Site VHP steam saving due to process indirect heat recovery through steam mains (MW)

Tin

Steam turbine inlet steam temperature (°C)

Tout

Steam turbine exhaust temperature (°C)

Tcd

The condensation temperature (°C)

u

Process heating requirement (MW)

W

The potential shaft power generation by steam expansion (MW)

Subscripts

cd

Condensation

cm

Cooling medium

i

VHP, HP, MP, and LP steam mains, respectively

IN

New steam main introduction

IN−1

Higher pressure steam main adjacent to the added new steam main

IN+1

Lower pressure steam main adjacent to the added new steam main

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Centre for Process Integration, School of Chemical Engineering and Analytical ScienceUniversity of ManchesterManchesterUK

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